Land Rover experts! After finally getting my engine bolted in, I realized there was a threaded hole in the oil filter housing that I never noticed. Does anyone know if this is for an oil pressure sensor or oil cooler? I'll get pics up soon, but the 3.9 is a 36D000 series.

Just to clarify, I'm swapping from a 3.5 carb to a 3.9 EFI.

Thanks!